🎯 Step 1 — What do you want to do?
Choose Pre-test Reference if you haven't tested yet and want to know what pressure drop is permissible. Choose Test Result if you've completed your 2-minute test and want a pass/fail verdict.
⛽ Step 2 — Fuel Type
Select the fuel gas in the installation you are testing.
📏 Step 3 — Pipework Lengths
Enter the total length in metres for each pipe size used. Leave unused fields blank or as 0.
Copper
Steel / Stainless Steel
⚙️ Step 4 — Meter Type
The meter's internal volume forms part of the total IV under Edition 4.
A — Pipe volume0.00000 m³
B — Pipe + 10% fittings (A × 1.1)0.00000 m³
C — Meter volume0.00000 m³
D — Total IV (B + C)0.00000 m³
📋 Next Steps
📊 Permissible Limits Reference (Edition 4)
🔵 Natural Gas (Table 3)
| Installation Volume (m³) | Max Drop (mbar) |
|---|---|
| ≤ 0.005 | 8 |
| > 0.005 – ≤ 0.010 | 4 |
| > 0.010 – ≤ 0.015 | 2.5 |
| > 0.015 – ≤ 0.035 | 1 |
🟠 LPG (Table 5)
| Installation Volume (m³) | Max Drop (mbar) |
|---|---|
| ≤ 0.0025 | 2 |
| > 0.0025 – ≤ 0.005 | 1 |
| > 0.005 – ≤ 0.01 | 0.5 |
| > 0.01 – ≤ 0.035 | No perceptible movement |
🟡 LPG/Air (Table 2)
| Installation Volume (m³) | Max Drop (mbar) |
|---|---|
| ≤ 0.025 | 1.5 |
| > 0.025 – ≤ 0.035 | 0.5 |